Triptych painted by Bosch in 1482?

You probably mean the 'Haywain', which may have been painted a few years later than 82. 'The Garden of Earthly Delights' is turn of the century.

Of the ones existing today 25 are definitely by his hand. Another 25 may or may not be genuine.

Bosch has several triptychs, including garden of earthly delights, seven deadly sins of the round table, all circa 1400-1500

The triptych is named 'Garden of Earthly Delights', and is his most famous work. Painted between 1505-1510. The left panel depicts the Creation of Eve in the Garden, the center panel is the Garden of...

A triptych is a work of art (usually a panel painting) which is divided into three sections, or three carved panels which are hinged together and folded.